/Engine/Source/Runtime/SignalProcessing/Public/DSP/AudioChannelFormatConverter.h
FChannelMixEntrydenotes how an input channel should be mixed into an output channel.
struct FChannelMixEntry
float
Gain
The scalar gain to apply to input audio samples when adding them to output audio samples.
int32
InputChannelIndex
The index of the input channel to use as a source.
int32
OutputChannelIndex
The index of the output channel to use as a destination.